The claim that all complex life forms evolved from one single cell is the largest con ever perpetrated on the world, IMO.
You are entitled to your
opinion
Biology categorizes from the simplest cell to the most complex and that work is informative, interesting and should be applauded.
However, the “tree of life” that I have seen do not provide indisputable evidence of what specifically evolved from one species to another species starting with the first cell and consummating with the last species.
Nore is a phylogenetic tree meant to convey that kind of detailed information.
It is speculation and I do believe the sequence or the timing can be proven.
Ow, it definatly is not "speculation". The tree, that is.
The tree, is the very opposite. It is actually a graphical representation of
real-world data points coming from a very wide range of
independent lines of evidence.
So not only does the tree represent real-world data, the very shape of the tree is confirmed by multiple lines of independent evidence. So there is
convergence between all these different fields.
That's what makes it such a solid theory: the multiple confirmation from various indepent lines of evidence.
Furthermore, all trees do not agree with one another, which one is correct, if any?
While there can be variations when drawing the tree based only on a single gene for example, there are perfectly sensible explanations for it. None of these variations pose any real problems to the larger picture.
And on high taxonomical levels, there are no such variations.
For example, you won't find a line of evidence that suggests that humans are more closely related to cats then they are to primates.
I have seen no one in this group that can prove the immediate predecessor of the Equidae or bovine family nor can any evidence be shown of a different species evolving from either of these.
Why would we be able to to pinpoint with such accurate detail what the "immediate predecessor" was of any given species?
Also, if you would actually understand the very gradual nature of evolution, how
populations evolve and not individuals, how vague the boundaries of defining a "species" is in the larger picture which keeps geological time in mind,... you would understand how it is very unreasonable to make such demands.
Is it not amazing how many different species have been on earth for what some claim as millions of years but they have not evolved into any different species during that time?
For a person who actually understands the evolutionary process, not really no... It's "amazing", yes... But not in the way you mean it.
It's the same kind of "amazing" as water turning into ice when it freezes. Fascinating process, I'm sure. But when you understand the basic laws of physics and chemistry, you'ld also understand how, next to "amazing", it is also is quite inevitable.
Some have adapted to changing environments so there are some small differences but they are still within the same species.
If a population would brinf forward inviduals of a completely different species, evolution would be falsified.
Organisms always produce more of their own with mere microscopic changes (variation, if you will). Each generation, these changes accumulate.
1+1+1+1+...+1 = big number.
Descendents of mammals will always be mammals.
Descendents of cats will always be felines, mammales, tetrapods, vertebrates,...
Cats will not evolve into canines. Not tomorrow, not a billion years from now.
Cats are felines. Canines are another branch.
All descendents of felines, will be sub-species of felines.
The kind of evolution that YOU are discussing, does not exist. Nore does it match the theory of evolution as biologists define it.